Create a separate src for colorspace tests

src/core/SkColorSpace.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorSpace.h"
 #include "SkColorSpace_Base.h"
 #include "SkColorSpacePriv.h"
@@ skipping 338 matching lines @@
 
     // It's important to check fProfileData before named gammas.  Some profiles may have named
     // gammas, but also include other wacky features that cause us to save the data.
     switch (src->fGammaNamed) {
         case kSRGB_GammaNamed:
         case k2Dot2Curve_GammaNamed:
         case kLinear_GammaNamed:
             return (src->fGammaNamed == dst->fGammaNamed) && (src->fToXYZD50 == dst->fToXYZD50);
         default:
             // If |src| does not have a named gamma, fProfileData should be non-null.
-            SkASSERT(false);
+            // FIXME (msarett): We may hit this case on pngs that specify float gammas.
+            //                  Gamma can be non-standard, but we don't have a profile
+            //                  to fall back on.  What do we do?
             return false;
     }
 }
 
 bool SkColorSpace::gammasAreMatching() const {
     const SkGammas* gammas = as_CSB(this)->gammas();
     SkASSERT(gammas);
     return gammas->fRedType == gammas->fGreenType && gammas->fGreenType == gammas->fBlueType &&
            gammas->fRedData == gammas->fGreenData && gammas->fGreenData == gammas->fBlueData;
 }
@@ skipping 22 matching lines @@
            gammas->fBlueType == SkGammas::Type::kTable_Type;
 }
 
 bool SkColorSpace::gammasAreParams() const {
     const SkGammas* gammas = as_CSB(this)->gammas();
     SkASSERT(gammas);
     return gammas->fRedType == SkGammas::Type::kParam_Type &&
            gammas->fGreenType == SkGammas::Type::kParam_Type &&
            gammas->fBlueType == SkGammas::Type::kParam_Type;
 }